Game features:
Automatic synthesis acceleration double gold coin special effect allows you to hang up and break through
Collect various cards to gain group gain and boss life gain
Leaderboard function, compete with other players
This is a free game, and will not take the initiative to pop up ads, will not affect the game experience
The game does not need the network, and can pass at any time to play boss
Various characteristic attack forts form interactive firepower
Green Fort: maximum attack distance
Red battery: splash damage
Yellow battery: laser scanning
Blue turret: range deceleration
Accumulate energy for air support
The difficulty of more than 2000 levels is gradually increasing. I don't know what will happen at the end of the game